Receive emails but cannot reply or send emails

When I want to send an email to anyone, I prepare it and send it and I copy my personal email and bcc my homestead email. The person does not receive the email, my personal email does not receive the email but my bcc email arrives.

This even happens when I reply to a person's email. Same thing. I cannot use this email and I get people annoyed for not responding.

How can this be fixed?